Re: [O] still seeing semi-regular lockups

[Eric Abrahamsen]

Daimrod <address@hidden> writes:

> Bastien <address@hidden> writes:
>
>> Hi Eric,
>>
>> Eric Abrahamsen <address@hidden> writes:
>>
>>> After Nicolas made the last round of improvements to the caching
>>> mechanism I got far fewer hangs with Org, but they are still happening.
>>> Maybe once a day or so, on average, editing something in an Org buffer
>>> causes emacs to hang, and my fans to spin up, and there we are until I
>>> kill emacs.

[...]

> I have also semi-regular lockup with org-mode. I have opened a bug on
> debbugs and here is what Stefan told me to try to debug this:
>
>> You can try `debug-on-event'.
>> 
>> There's jit-lock-debug-mode but it doesn't disable inhibit-quit.
>> So you'll need to additionally use
>> 
>>    (advice-add 'jit-lock--debug-fontify :around
>>      (lambda (fun &rest args)
>>        (with-local-quit (apply fun args))))
>> 
>> Of course sometimes this doesn't work because jit-lock-debug-mode
>> changes the way things are executed and the bug may not manifest itself
>> any more, but it's worth a try.
>> 
>> Another source of info is to
>> 
>>   M-x trace-function RET org-adaptive-fill-function RET
>>   M-x trace-function RET org-element-at-point RET
>>   M-x trace-function RET org-element--cache-sync RET
>>   M-x trace-function RET org-element--cache-process-request RET
>> 
>> Then reproduce the hang, then break the hang somehow (maybe with the
>> jit-lock-debug hack above, or maybe with debug-on-event, or with C-g C-g
>> C-g, ...), then look at the *trace..* buffer.
>
> I'll try to see what I can find this week end and report back.
>
> By the way, if you want to see in which part the infloop occurs, you can
> attach a gdb debugger to the running emacs, source the
> <path-to-emacs-source>/src/.gdbinit file and use the `xbacktrace' command.
>
> $ gdb <path-to-emacs-executable> <emacs-pid>
> gdb) source <path-to-emacs-source>/src/.gdbinit
> ...
> gdb) xbacktrace
>
> You can also use the `bt' command but it contains much more noise.

Thanks! This is the sort of thing I assumed I'd have to do, and it's
good to have an actual recipe. If you're on it, I might take the lazy
option and spectate for now... :)